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From the top of a cliff, a person uses a slingshot to fire a pebble straight downward, which is the negative direction. The initial speed of the...

From the top of a cliff, a person uses a slingshot to fire a pebble straight downward, which is the negative direction. The initial speed of the pebble is 8.40 m/s. (a) What is the acceleration (magnitude and direction) of the pebble during the downward motion?

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